Electrically-heated smooth ing-c ylin der



No Model.)

W. MITCHELL. v ELEGTRIGALLY HEATED SMOOTHING CYLINDER.

No. 468,426. Patented Feb. 9, 1892.

MW! will WITNESSES INVENTOR UNITE STATES PATENT OFFTCE.

\VILLIS MITCHELL, OF MALDEN, ASSIGNOR TO THE BUTTERFIELD-MITCHELL ELECTRIC: HEATING COMPANY, OF BOSTON, MASSACHUSETTS.

ELECTRlCALLY-HEATED SMOOTHlNG-CYLINDER.

SPECIFICATION forming part of Letters Patent No. 468,426,11ated February 9, 1892.

' Application filed May 26, 1891. Serial No. 394,121. (No model.)

To all whom it mayconcerm cylinder, which affords the heating-surface Be it known that I, WILLIS MITCHELL, a for smoothing the garments. The closed -citizen of the United States, residing at Malouter end of this shell is fastened to the shaft den,in the county of Middlesex and State of C by screws f. The open inner end of said 55 llI-assachusettahave invented certain new and shell is constructed. with inwardly-extending useful Improvements in Electrically-Heated slots F, which receive studs or lugs g, formed Smoothing Cylinders; and I do hereby deon theouter ends of relatively-fixed arms G, clare the following to bea full, clear, and exthe engagement of these studs or lugs with act description of the invention,such as will the sides of the said slots preventing the 60 to enable others skilled in the art to which it said shell from turning. These arms extend appertains to make and use the same. radially and rigidly from a heating-body H of This invention relates to ironing or smoothcylindrical form, which is concentric with and ing devices for garments or fabrics in which mounted on the shaft C. This heating-body the latter are passed between cylinders or consists of a metallic inner cylinder or lining 6 5 rolls, one of these being heated by electrical '71., an exterior cylinderI of magnetic metal,

devices contained therein. and an interposed layer t' of insulating mate- My object is to increase the serviceabilityrial. The outer cylinder I is the chief and and heating power of these internal devices. only essential part of the body and may be .To this end I make use of a cylindrical heatused without the others on a shaft constructed 7o ing-body of magnetic metal inclosed within of or coated with insulating material; but

the shell of the hollow smoothing-cylinder, when a shaft of electrically-conducting matethis body being formed with radial studs or rial is used an interposed mass of insulating cores, which are wound with wire helices in material becomes necessary, and if this is atan electric circuit, the said cores being magtached to cylinder Ia harder liningis also use 75 netized thereby and the said body being essary to insure the proper attachment of said heated both by the magnetic action or inbody to said shaft without turning. This atduced electric currents set up therein and by tachment is effected by a radial stud 0r pin J the resistance of the wires, the heat thereof on shaft C,which enters a longitudinal groove passing through the said studs to the said body in the inner face of the said inner cylinder or 80 0 by conduction, all as hereinafter set forth. lining h.

In the accompanying drawings, Figure 1 The cylinder I is provided with a number represents in elevation a smoothing-machine of radial studs or cores K, on each of which embodying my invention. Fig. 2 represents an electric heating-cylinder L is sleeved, 0011- an enlarged perspective view of the heatingsisting of a wire M, wound in concentric spi- 85 3 5 body and circuit-closing devices with a part rals about the said core, interposed cylindriof the shaft on which the said bodyis mounted cal layers 70, of asbestos or other insulating and the supporting-arm for the circuit-010s material, serving to prevent short-circuiting. ing brushes or springs. Fig. 3 represents a Each heating-cylinder L has a metallic or detail longitudinal section through the said other protective conducting-cap Z covering it. 0

body. Fig. 4 represents a detail perspective The same wire M is used throughout, passing view of the outer case or shell of the cylinfrom one heating device L to another, and it der, and Fig. 5 represents an end view of the is in an electric circuit. Then this circuit is same. I closed, the cores K are heated, and they are A designates the frame of the machine; B, also magnetized. The heat generated in these 5 5 the treadle; C, the upper shaft; D,the lower cores passes by conduction to the cylindrical shaft geared thereto, and E the lower roll or body I, and the magnetization of the cores cylinder, which supports the clothes or fabric also extends thereto, causing molecular diswhile these are being ironed by the upper turban-0e and probably induced electrical heating and smoothing cylinder carried by currents, and thus indirectly increasing the mo the said shaft 0. heat of the said body or cylinder to a con- F designates the outer shell of thisheatingsideralole degree. This heat passes both by radiation and by conduction to the outer shell F, which is in contact with the caps l and arms G of conducting material. The ends of the wire M extend through the open inner end of the smoothing-cylinder to rings N O, of conducting metal, fast on rings n 0 of insulating material, which are fast on shaft 0, one end of the Wire going to ring N and the other through insulating-ring n to ring 0. Brushes or contact-springs P Q are in contact with rings N 0, respectively, and are supported by a rigid horizontal arm R of frame A, being held adj ustably by set-screws 3, passing through insulating-blocks S, attached to said arm. This attachment allows the said brushes or contact-springs to be raised or lowered when necessary and held in such new position. Oircuit-wires T U extend from these brushes or contact-springs to the source of electricity. Owing to this arrangement and combination of circuit-making devices, the rotation of the shaft and the devices mounted thereon will not tend to break the circuit or entangle the wires.

The space between the heating magnetic cylinder I and the outer shell may be filled with soapstone for better retention of the heat.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is

1. In an electrically-heated smoothing device, a cylindrical heating-body of magnetic metal provided with studs or cores, in combination with an electrical conductor forming part of an electric circuit and wound in helices about the said cores for heating byresistance and magnetization, substantially as set forth.

2. A cylindrical outer shell for smoothing fabrics, in combination with the shaft on which it is mounted, an interposed cylinder of mag netic material provided with radial magnetic studs or cores, helices and interposed insulating material v forming electric heaters around said cores, caps of heat-conducting material covering said heaters and in contact with the said shell, and devices for closing an electric circuit, including the said cores, for the purpose set forth.

3. A magnetic metallic cylinder provided with studs or cores, in combination with a wire wound thereon and forming part of an electric circuit, for the purpose set forth.

4:. In an electrically-heated smoothing-cylinder, the combination, with the outersmoothing-shell, of a shaft upon which it is mounted and a series of bobbins provided with metallic cores and composed of a wire forming part of an electric circuit, substantiallyas set forth.

In testimony whereof I atfix my signature in presence of two witnesses.

. \VILLIS MITCHELL.

Witnesses:

E. W. PIERCE, W. R. JoHNsoN. 

